updated recoverable readme with linkg

contracts/core/recoverable/README.md

@@ -1,12 +1,19 @@
 # Recoverable Accounts
 Recoverable accounts are a special type of accounts that let owners define a set of guardians to help recover the account in case the private key of the owner is compromised (forgotten, disclosed, stolen...).
 
-## Context
+## Context 
 
 As explained by Vitalik in a famous post (https://vitalik.ca/general/2021/01/11/recovery.html), guardians are the next thing after multisig wallets.
 
 Observe the image below from the mentioned blog post to visualize how guardians work.
 
 ![Guardians][guardians-image]
 
-[guardians-image]: ../../../.github/img/guardiansDiagramVitalik.png
+[guardians-image]: ../../../.github/img/guardiansDiagramVitalik.png
+
+## More information:
+ - https://vitalik.ca/general/2021/01/11/recovery.html
+ - https://medium.com/nightlycrypto/smart-wallets-guardians-756d27a749c7
+ - https://www.makeuseof.com/what-is-crypto-social-recovery-wallet-how-does-it-work/
+ - https://support.argent.xyz/hc/en-us/articles/360022631992-About-guardians
+ - https://docs-wallet.loopring.io/security/guardians